package com.hmdp.service.impl;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.conditions.query.LambdaQueryChainWrapper;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_KEY;
import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_TTL;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryTypeList() {
        // 1. 查询redis类型列表
        String typeKey = CACHE_SHOP_TYPE_KEY;
        String shopTypeJson = stringRedisTemplate.opsForValue().get(typeKey);
        List<ShopType> typeList = null;
        // 2. 判断是否存在
        if (StrUtil.isNotBlank(shopTypeJson)) {
            // 3. 存在，直接返回
            typeList = JSONUtil.toList(shopTypeJson, ShopType.class);
            return Result.ok(typeList);
        }
        // 4. 不存在，查询数据库
        typeList = list(new LambdaQueryWrapper<ShopType>()
                .orderByAsc(ShopType::getSort));
        // 5. 不存在，返回错误
        if (typeList == null) {
            return Result.fail("店铺类型不存在！");
        }
        // 6. 存在，写入redis
        stringRedisTemplate.opsForValue().set(typeKey, JSONUtil.toJsonStr(typeList),
                CACHE_SHOP_TYPE_TTL, TimeUnit.MINUTES);
        // 7. 返回
        return Result.ok(typeList);
    }
}
